XML 168 R140.htm IDEA: XBRL DOCUMENT
v3.20.4

Right of Use Assets - Reconciliation of changes of the right of use assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance | $ 146 | $ 52 |
Transfers to right-of-use assets |  | (1) |
Additions to right-of-use assets | 16 | 81 |
Depreciation, right-of-use assets | (21) | (18) |
Changes in foreign exchange rates |  | (1) |
Right-of-use assets, ending balance | 141 | 146 | $ 52
Land |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance | 58 | 29 |
Transfers to right-of-use assets |  | 0 |
Additions to right-of-use assets | 3 | 32 |
Depreciation, right-of-use assets | (3) | (1) |
Changes in foreign exchange rates |  | (1) |
Right-of-use assets, ending balance | 58 | 58 | 29
Buildings |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance | 16 | 22 |
Transfers to right-of-use assets |  | 0 |
Additions to right-of-use assets | 13 | 2 |
Depreciation, right-of-use assets | (5) | (4) |
Changes in foreign exchange rates |  | 0 |
Right-of-use assets, ending balance | 24 | 16 | 22
Vehicles |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance | 2 | 1 |
Transfers to right-of-use assets |  | 0 |
Additions to right-of-use assets | 0 | 0 |
Depreciation, right-of-use assets | (1) | (2) |
Changes in foreign exchange rates |  | 0 |
Right-of-use assets, ending balance | 1 | 2 | 1
Equipment |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance | 25 | 0 |
Transfers to right-of-use assets |  | (1) |
Additions to right-of-use assets | 0 | 2 |
Depreciation, right-of-use assets | (9) | (11) |
Changes in foreign exchange rates |  | 0 |
Right-of-use assets, ending balance | 16 | 25 | 0
Pipeline |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance | 45 | 0 |
Transfers to right-of-use assets |  | 0 |
Additions to right-of-use assets | 0 | 45 |
Depreciation, right-of-use assets | (3) | 0 |
Changes in foreign exchange rates |  | 0 |
Right-of-use assets, ending balance | $ 42 | 45 | 0
IFRS 16 |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance |  | 85 |
Adjustments on recognition |  |  | (5)
Transfers to right-of-use assets |  |  | (38)
Right-of-use assets, ending balance |  |  | 85
IFRS 16 | Land |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance |  | 28 |
Adjustments on recognition |  |  | (1)
Transfers to right-of-use assets |  |  | 0
Right-of-use assets, ending balance |  |  | 28
IFRS 16 | Buildings |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance |  | 18 |
Adjustments on recognition |  |  | (4)
Transfers to right-of-use assets |  |  | 0
Right-of-use assets, ending balance |  |  | 18
IFRS 16 | Vehicles |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance |  | 4 |
Adjustments on recognition |  |  | 0
Transfers to right-of-use assets |  |  | (3)
Right-of-use assets, ending balance |  |  | 4
IFRS 16 | Equipment |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance |  | 35 |
Adjustments on recognition |  |  | 0
Transfers to right-of-use assets |  |  | (35)
Right-of-use assets, ending balance |  |  | 35
IFRS 16 | Pipeline |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance |  | $ 0 |
Adjustments on recognition |  |  | 0
Transfers to right-of-use assets |  |  | 0
Right-of-use assets, ending balance |  |  | $ 0

X
- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_h&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_AdditionsToRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_a&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_DepreciationRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in financial assets resulting from other movements. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph IG20B -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_IG20B&doctype=Implementation%20Guidance -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35H&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35I&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseThroughOtherMovementsFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in financial assets resulting from transfers. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph IG20B -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_IG20B&doctype=Implementation%20Guidance -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35I -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35I_d&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35H&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseThroughTransfersFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_RightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Increase (Decrease) Through Foreign Exchange, Right Of Use, Financial Assets + References No definition available. + Details
Name: | tac_IncreaseDecreaseThroughForeignExchangeRightOfUseFinancialAssets
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Right-Of-Use Assets + References No definition available. + Details
Name: | tac_RightOfUseAssetsRollForward
Namespace Prefix: | tac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_OfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=tac_PipelineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_InitiallyAppliedIFRSsAxis=tac_IFRS16Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |